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Mitigating parametric instabilities in plasmas by sunlight-like lasers
- Source :
- Matter and Radiation at Extremes, Vol 6, Iss 5, Pp 055902-055902-8 (2021), Matter and radiation at extremes 6(5), 055902-(2021). doi:10.1063/5.0054653
- Publication Year :
- 2021
- Publisher :
- AIP Publishing LLC, 2021.
-
Abstract
- Sunlight-like lasers that have a continuous broad frequency spectrum, random phase spectrum, and random polarization are formulated theoretically. With a sunlight-like laser beam consisting of a sequence of temporal speckles, the resonant three-wave coupling that underlies parametric instabilities in laser–plasma interactions can be greatly degraded owing to the limited duration of each speckle and the frequency shift between two adjacent speckles. The wave coupling can be further weakened by the random polarization of such beams. Numerical simulations demonstrate that the intensity threshold of stimulated Raman scattering in homogeneous plasmas can be doubled by using a sunlight-like laser beam with a relative bandwidth of ∼1% as compared with a monochromatic laser beam. Consequently, the hot-electron generation harmful to inertial confinement fusion can be effectively controlled by using sunlight-like laser drivers. Such drivers may be realized in the next generation of broadband lasers by combining two or more broadband beams with independent phase spectra or by applying polarization smoothing to a single broadband beam.
- Subjects :
- Nuclear and High Energy Physics
Physics, Multidisciplinary
Phase (waves)
Physics::Optics
QC770-798
FREQUENCY
Light scattering
law.invention
QC350
symbols.namesake
Speckle pattern
Optics
FUSION
law
Nuclear and particle physics. Atomic energy. Radioactivity
ddc:530
Electrical and Electronic Engineering
Inertial confinement fusion
Physics
Science & Technology
business.industry
Polarization (waves)
Laser
Atomic and Molecular Physics, and Optics
REDUCTION
Nuclear Energy and Engineering
FINITE-BANDWIDTH DRIVER
Physical Sciences
symbols
BRILLOUIN
business
Raman scattering
Beam (structure)
STIMULATED RAMAN-SCATTERING
Subjects
Details
- Language :
- English
- ISSN :
- 24682047
- Volume :
- 6
- Issue :
- 5
- Database :
- OpenAIRE
- Journal :
- Matter and Radiation at Extremes
- Accession number :
- edsair.doi.dedup.....496be6bb862d913f3a5b09310363600c
- Full Text :
- https://doi.org/10.1063/5.0054653